llvm dev - Nov 2019 - RISC-V LLVM sync-up call 14th Nov 2019

For background on these calls, see
<http://lists.llvm.org/pipermail/llvm-dev/2019-September/135087.html>.

Reminder: the purpose is to co-ordinate between active contributors.
If you have support questions etc then it's best to post to llvm-dev.

We have a call each Thursday at 4pm GMT, via
<https://meet.google.com/ske-zcog-spp>.

I've created a shared calendar which may help in keeping track, which
is hopefully accessible at:
  *
<https://calendar.google.com/calendar/b/1?cid=bG93cmlzYy5vcmdfMG41cGtlc2ZqY25wMGJoNWhwczFwMGJkODBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ>
  *
<https://calendar.google.com/calendar/ical/lowrisc.org_0n5pkesfjcnp0bh5hps1p0bd80%40group.calendar.google.com/public/basic.ics>

Issues to discuss today include the following:
* Infinite loop in TableGen. Apparently only shows up for RISC-V,
though feels likely we're victim of an obscure miscompile
https://reviews.llvm.org/D69741 - does anyone have time to help out
here?
* Flagging up for extra review: R_RISCV_32_PCREL
<https://reviews.llvm.org/D70204>, re-opened CFI directive fix
<https://reviews.llvm.org/D69723>
* R_RISCV_SET6 semantics?
* Sam is working on ilp32e codegen
* The patch to use compiler-rt has seen a lot of activity recently
https://reviews.llvm.org/D68407
* I think we're about ready to land the march/mabi change D69383
* In-flight patches of note:
  * GlobalISel return lowering  https://reviews.llvm.org/D69808 awaiting review
  * V extension MC layer patch https://reviews.llvm.org/D69987

Best,

Alex